How to load extension within chrome driver in selenium with python

All my efforts to open chrome browser with Browsec extension enabled are failing. Here is what i tried in last -

# Configure the necessary command-line option.
options = webdriver.ChromeOptions()
options.add_argument(r'--load- 
extension=C:\Users\lap0042\AppData\Local\Google\Chrome\User 
Data\Default\Extensions\omghfjlpggmjjaagoclmmobgdodcjboh')

# Initalize the driver with the appropriate options.
driver = webdriver.Chrome(chrome_options=options)

driver.get("http://stackoverflow.com")

This results in error "Failed to load extension from . Manifest files is missing or unreadable"

After search for this error I get that Manifest.json file should be renamed to manifest.json.txt but doing this resulted in same error.

Any help will be highly appreciated